77388973 has 2 divisors, whose sum is σ = 77388974. Its totient is φ = 77388972.

The previous prime is 77388959. The next prime is 77389001. The reversal of 77388973 is 37988377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77387209 + 1764 = 8797^2 + 42^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77388973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77388973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77388473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38694486 + 38694487.

It is an arithmetic number, because the mean of its divisors is an integer number (38694487).

Almost surely, 2^77388973 is an apocalyptic number.

It is an amenable number.

77388973 is a deficient number, since it is larger than the sum of its proper divisors (1).

77388973 is an equidigital number, since it uses as much as digits as its factorization.

77388973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 52.

The square root of 77388973 is about 8797.1002608814. The cubic root of 77388973 is about 426.1472541547.

The spelling of 77388973 in words is "seventy-seven million, three hundred eighty-eight thousand, nine hundred seventy-three".